Original scientific paper
LIGHTNING IMPULSE MODELING AND SIMULATION OF DRY-TYPE AND OIL-IMMERSED POWER- AND DISTRIBUTION TRANSFORMERS
Jasmin Smajic
; University of Applied Sciences of Eastern Switzerland (HSR)
Roman Obrist
; University of Applied Sciences of Eastern Switzerland (HSR)
Martin Rüegg
; University of Applied Sciences of Eastern Switzerland (HSR)
Bogdan Cranganu-Cretu
; ABB Switzerland Ltd.
Carlos Roy
; ABB SA, Zaragoza, Spain
Benjamin Weber
; ABB AG, Brilon, Germany
Ebrahim Rahimpour
; ABB AG, Bad Honnef, Germany
Abstract
This paper presents in detail numerical methods and techniques for lightning impulse (LI) modeling
and simulation of power and distribution transformers. The modeling methods are based on equivalent
circuits of transformer winding entities resulting from the initial winding discretization determined by the
required accuracy. The parameters of the equivalent circuit such as resistances and self- and mutual
capacitances and inductances are obtained from field simulations (FEM). The circuit equations of the
transformer’s equivalent circuit written in the state space form yield a large system of differential equations
that is solved in time-domain by using the standard Runge-Kutta numerical integration technique. The
obtained solution represents the voltage distribution over the winding in each moment of the LI-time (50μs).
The results verification by comparison against measurements is presented in detail.
Keywords
Lightning impulse; transformer winding modeling; transient simulation; electric and magnetic coupling; lumped parameters; and distributed parameters
Hrčak ID:
199254
URI
Publication date:
15.8.2017.
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